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Q. |
Which of the following bacterium causes crown gall disease in plants? |
A. | Bacillus thurigiensis |
B. | Agrobacterium tumefaciens |
C. | Pseudomonas fluorescens |
D. | None of these |
Answer» B. Agrobacterium tumefaciens | |
Explanation: Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die. |
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